If its analog, sure, no issues. With the behavior you describe, it could be an analog trunked system
SDRTrunk Not hearing talkgroups
- Thread starter AngWay
- Start date
ok i'm hearing traffic on 161.188 and i'm only hearing one side of the conversation in sdr++
Rail frequency, this is either 161.1825 or 161.190. Rather than reporting your findings here you should take advantage of your RR premium subscription & utilize RR's Frequency Data search or the FCC data search to look up your findings. Through the latter search I found a number of Norfolk Southern licenses for your county on 161.190
ok will do thanks
And iirc, some of those rail freqs are simplex or low wattage so you may not hear both sides unless your close.
ok...quick question i bought this fm band stop filter and i'v tried hooking it up but it's not filtering out the fm stations on sdr++ i'v tried turning it around but it's still not working. what could i be doing wrong or is it the filter? Thanks
Attachments
i have the noolec LNA and it's bias tee and external powered right now i have it at my receiver and it seems to perform good do u think i would have a lot more performance if i put it at my antenna on the roof? Thanks
Basically, putting an lna at the antenna reduces noise picked up along the way, and will also make up any loss in long runs of coax.
yeah from what i can see it does really good where it's at i don't see how putting it at the antenna is gonna provide that much more performance. thats just my opinion. Thanks tho...i can't get the fm filter i bought to work i have tried it everywhich way u can but it's not blocking the fm radio channels. am i doing something wrong?
Describe “not working“. You can start by posting screenshots of the spectrum for the broadcast FM band between 88‑108MHz, with and without the filter.
well here's the thing i can see it is working now it's blocking all the fm stations except 1, and the one it is not blocking is the closet radio station to me. why is that it's blocking all the rest?
What is the frequency of the station it is not blocking? What is the signal strength of the station with/without the filter? You can start by posting screenshots of the spectrum for the broadcast FM band between 88‑108MHz, with and without the filter.
Alright the first pic is with the filter and the second pic is without the filter.
Attachments
If you are losing any signal in the 100 feet of coax the amp can make it up. It amplifies the signal and sends it down to the sdr. If you are losing signal, the am has less of a signal to boost.
Turn off AGC. It looks like the noise floor is elevated with the filter. I suspect the gain is different for the two measurements.
[edit] Bottom line: you are getting significant attenuation. If you turn off AGC for this experiment, the effect should be more visible.
Last edited:
ok i tried that if i remove the LNA it blocks the station but it can still be heard with the gain all the way up if i add the LNA it still shows the station no matter what i do. and it's just that one station
The purpose of the fm filter is to attenuate the fm signals to an acceptable level. It is counteracting the effect of the LNA in the fm band. I am not surprised that it does not completely block the strong fm signal. But it should be attenuated to a low enough level that it does not interfere with reception in other bands.
From your descriptions, it sounds like the filter is performing as expected.
good to know thank you.
on the honaker oakwood and elkin's branch control channels . only the honaker has alternate channels the other two do not what does it mean when sites don't show alternate channels? Thanks
Attachments
RR no longer differentiates between primary and alternate designations. "c" is used to designate frequencies that are control channel capable. This includes both primary and secondary control channels. The database shows multiple control channel capable frequencies for all 3 of the Buchanan County sites.
FYI: DSDPlus logs information about P25 systems in DSDPlus.P25data. This file includes information on site channels and their usage (CC/SCC/voice/data). CC is a frequency used as a control channel. SCC is a secondary control channel. This information also shown in SDRTrunk in the Details tab. You can use this information to confirm the accuracy of the RR database.
Similar threads
